题目内容
He did well in the examination. He _____ hard at his lessons..
| A.must have worked | B.can have worked |
| C.will have worked | D.has worked |
A
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David was bad at his studies, so when I was told he did well in the final exam this time, I found it really ______.
| A.unbelievable | B.harmful | C.rude | D.fundamental |